Cylinder-reboring mechanism.



lL. Husten CYLINDER msnm@ MECH/mism.

APPUCA'I'ION FSLEJ MAY 1.1, 15th.

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Y Wlmfsm l Waff/wwf M .Zn fdgmf Fwefsefg f A Bf fili/UTURMEV l EDGAR F. H EISEB.,` 0F KINGSTGN, MISSOURI.

CYLINDER-REBORN G MECHANISM.

1 'o au whom 'it may concern: g

Be it known that I, Encan F. HEISER, a `,ctirren of the United States, residing at Kingston, in the county` of Caldwell and State of Missouri, have invented certain new and useful Improvements in Cylinder-Reboring Mechanism, of which the following .is a full and exact specification.

The present invention relates to improvements in metalworking machinery, and more `particularly to devices for use in the reeborlng of metal cylinders, a devlce of which general character is illustrated and described in my co-pending application Serial No. 30,105, yfiled May 24, 1915.

'One of the special objects of the present invention is to devise an improved toolholding construction rfor machines doing'this class of work, whereby the tool may be conveniently ad]usted and its'adjustment be maintained for successive boring operations, igt desired. It is a further object of vthe invention to provide a toolholding construction of such a character that the position of the tool may he so changed as to facilitate the grinding or sharpenlng; of the tool simply by conf tinued rotation'of the tool-carrying shaft with the tool in engagement with the inner face of thel cylinder.

Further features ol improvement reside in. the new mode of grinding operation for sharpening tools as related to the practice of theinvention, as hereinafter set forth.

With these various objects in view, the

.invention will now be described with refer-V ence to the accompanying drawlng illustratiiig one form of embodiment of the inven tion and mode of practising the same, after'` which those features of the present improve- .meuits deemed to be nojvel will be severally set `forth und defined inthe appended claims.

in `the drawingt' Figure l is a trahsverse section through a cyiindcr and rc-bfiiring mechanism therefor, thl section being taken thrmlgh-the tool-carrying portion'` of the boring sha ft;

Fig. 2 is a similar .'vicwon a smaller scale, showing the tobi-holder in plan and the tool shifted into position lfor grinding or sharpening the same;

Fig. 3 is a detail illustrating the position of ,the l'ool withrclation to the cylinder when modifying l; ieuronlour of the cutting edge; and

Fig. 4 is a fragmentary plan viewv of the struction are not herein i Specication ot Letters Patent. Patented J une 26, 1917,

Application led Hay 17, 1916. Serial No. 98,143

outline of the cutting edge as modified.

. cutting portion of the tool illustrating the Referring to the drawing in'detail, the

boring or tool-carryn shaft 2 of the reboring mechanism is aapted to be mounted axially within the bore of the cylinder' 4, and operated to feed the shaft axially as the cutting operation proceeds, all as in my copending application above identified, yand the details of said `cuttin `and feeding conllustrated since the same form no essential part of the present improvements. As in my previous construc-4 tion, the toolwcarrying shaft 2 is provided right angles to the axis of the shaft 2, but in the present construction the axis of said opening, instead of intersecting the axis of the shaft, is located eccentrically of said shaft, so that the axis of the tool-holder 8,

which is mounted in said opening," will also occupy a position eccentric to the shaft. This tool-holder is provided with an axial opening 10 within which to mount the cutting tool 12. The holder 8 is also provided with the axial adjusting screw 14 in abutting relation with one end of the tool 12,

whereby the latter 'may be adjusted axially within the opening 10. The tool is clamped in adjusted/position by means of the `screw lf3 mounted inthe enlargedhead portion of the holder 8, and the latter is clampedwithin thc shaft opening 6 by the screw lli carried by the shaft 2 .m position to engage the .shank of said holder. i

ily means of' this tool holding arrangement it will be apparent that the tool can he adjusted AWithin the 'holder and the latter removed and rei-applied to the shaft without disturl-iing the adjustment of the tool as first made, and which is a distinct advantage where the same 'approximate adjustment of the `tool is desi red. to be maintained for Successive bore operations.

Figx'lre l illustrates the position of the l parts during the cutting or reboring operation.

rlbe cutting edge Q() vof the tool engages and culs the interior face of the cylinder 4 as the shaft 2 is rotated in the direction of the arrow in said figure, the euttng end or nose .ol the tool being formed to leave a slight'clearance space .22 behind said cutting edge. liy continued use of the tool the nose portion ywill be gradually worn down as indiraled ou an exaggerated scale by the dotted line 24, so that it becomes lll) 70 with a transverse opening 6, extending at necessary to sharpen the same, and this o eration in the prent case is accomplishes in the following manner.

Either the tool holder 8 is rotated through approximately 180 degrees within the open- .'i'ng 6 or the tool 12 is rotated Within.the

holder to the same extent, as shown in Fig. 2, and clamped in its new position relative to the shaft 2. A portion of the interior face of the cylinder 4 is treated with avsuitable abrasive material such as emery paste, and the shaft 2 rotated a few times with the parts arranged as just described, resulting in grinding of the tool down to the dotted line 26 (the ground-away portion being represented on an exaggerated scale) so that the line 24 represents the new end face of the tool; and when the tool is restored to operative position as in Fig. l a newly sharpened edge 20 is presented to the interior face of `the cylinder with the proper clearance space 22 at the rear of the cutting points. This result, viz., the sharpening of the tool by reversing its position and continuing the rotation of the boring shaft, isv obtained by virtue of the peculiar mounting of the tool eccentrically with relation to the shaft 2.

It is also desirable, for the purpose of preventin any scoring of the interior face of the cy inder in the process of re-boring, that the cutting edge 20 of the tool 12 be rounded off slightly at the rearend of said ed ref-that is, at the rear end thereof with re erence to the direction of the feeding movement of the tool axially of the cylirv der; ing-the tool slightly about its longitudinalaxis, either by rotating the tool within its socket or by simply rotating the holder within the shaft opening 6 to the required extent, thereby bringing the tool in the relation to thc cylinder somewhat as illustrated in Fig. 3; and then completing the sharpening operation by bnc or two final turns of the boring shaftnvith the tool in engagement with the abrasive surface of the cylinder. Since this shiftiltg of the tool into the-position shown in lhg. -i necessarily swings one corner of the ciltting end of the tool away from the interiort'ace of thecylinder, whereas the opposite corner at the op- )osite end of the cuttingv edge is swung irectly into said yface. the latterrorner is of course rounded ofi' as indicated at 28 in This result is accomplished by shift.

Claims:

1. In a cut-ting mechanism, the combination with a rotary tool-carrying shaft provided with an eccentric transverse opening, of a tool mounted on said shaft and within .said opening and adapted to be rotated into different angular positions therein with reference to the axis of said opening.

2. In a cutting mechanism, the combination with a rotary tool-carrying shaft, of Aa y cutting tool carried by said shaft, said tool being rotatable into diicrent ositions aboutan axis extending through t e cutting end of the tool at right angles to said shaft and eccentric thereto.

3. In a cylinder-reboring mechanism, the combination with a rotary tool-carrying shaft provided with a transverse openin having its axis at 1right angles to said sha t and eccentric thereto, of a cutting tool carricd by said shaft wlthin said opening and adapted to be clamped in various an lar positions with reference to the axis o said opening.

4. The method of sharpening the tools of cylinder irc-boring devices which consists in applying an abrasive to a portion of the interior face of the c linder, mounting the tool on the boring shafty with the axis of the tool at right angles to the shaft and eccentric thereto, and rotating said shaft .with the tool in engsigement with said abrasive surface but shifted about its axis out of normal cutting position. v

- The method of sharpening the tools of cylinder' reboring devices which yconsists in applying -an abrasive to a portion of the interior face of the cylinder, mounting the tool on the boring shaft with the axis of thc tool at right. angles to the shaft andeccentric thereto, rotating said shaft with the tool shifted about 'its axis to a position the reverse of its normal cutting position, and thereafter rotating the shaft with the tool shifted about its axis to a position intermediate said normal and revelse positions for slightly rounding ofi' a portion of the tools cutting ed 6. The meth of sharpening the tools of cyiinder reboring devices which 'consists in applying an abrasive to a portion of the intenor face of the cylinder, mounting the tool on the boring-shaft 'for adjustment about an axis at right angles to the shaft `and eccentric thereto, and i-ot'atin said shaft with the tool in engav ement wit -said abrasive surface but shi ed about said axis out of normal cutting position. f

7. In a cutting mechanism. the combination with a tool-c'airryiriar shaft, of a toolholder mounted d etechaily on. said shaft and provided with a too opening or socket extending at right angles to said shaft, a cutting tool mounted within said opening or socket, and means for adjusting the tool 'reference to the axis' of the opening, 'said `10 holder being tending :1t cutting tool moans for adjusting said tool Within said provided with a, tool socket eX- right angles to said shaft, a

socket and for clamping the same in ad- 1.3'

justed position.

E. F. HEISER.

mounted Within said sockot, :1nd 

